Mascherano, who arrived at Upton Park with international team-mate Carlos Tevez on 31 August, will not be able to play for Liverpool while his transfer is under consideration.

"The Premier League can confirm that, in accordance with its rules, Javier
Mascherano's registration documents were received from Liverpool FC prior to the transfer window closing," said the Premier League statement.

"The board will consider the terms of the registration as quickly as possible and notify the parties involved of its decision accordingly."